Apparatus for mounting purlins on a roof under structure



Dec- 20, 19 J. D. EDWARDS APPARATUS FOR MOUNTING PURLINS ON A ROOF UNDER STRUCTURE Filed May 23, 1958 3 Sheets-Sheet l INVENTOR.

Joan D. EDWARDS BY ,4 TTO/Z IUEYS Dec. 20, 1960 J. D. EDWARDS APPARATUS FOR MOUNTING PURLINS ON A ROOF UNDER STRUCTURE Filed May 25, 1958 3 Sheets-Sheet 2 INVENTOR.

JOHN "D. EDWARDS FIG. 1A

Dec. 20, 1960 J. D. EDWARDS 2,965,408

APPARATUS FOR MOUNTING FURL-INS ON A ROOF UNDER STRUCTURE Filed May 23, 1958 5 Sheets-Sheet 3 TIC-L2 37 3 4 PIC-L4 T165 T INVENTOR.

JOHN D. EDWARDS 2,965,408 1C6 Patented Dec.- 20, 1

APPARATUS FOR MOUNTING PURLINS ON A ROOF UNDER STRUCTURE The present invention relates to roof construction generally and in particular to an apparatus for mounting purlins on a roof under structure.

An object of the present invention is to provide an apparatus for mounting purlins on a roof under structure which is rapid and eflicient, one which enables an erector to save the steps of locating all of the purlins for one bay of a building within that bay prior to erection, and one which enables the erector to move at one time all of the purlins for a bay from a place of storage adjacent a crane and to move the same as a unit to a skeleton roof under structure.

Another object of the present invention is to provide a clamping element which lends itself to the efi'icient hoisting and placing of purlins on a roof under structure, one which has means for accommodating roof under structure of any angle to the horizontal, one which is positive in operation, and one which is economically feasible.

These and other objects and advantages of the present invention will be fully apparent from the following description when taken in conjunction with the annexed drawings, in which:

Figure 1 is an isometric view of a portion of a building substructure, showing a crane in use hoisting purlins to the roof under structure according to the method of the present invention,

Figure 1a is an elevational view of several purlins in position and supported upon the hoisting equipment shown in Figure 1, using the clamping means according to the present invention,

Figure 2 is a side elevational view of the clamping means of the present invention, shown in a position of use clamped upon an I-beam,

Figure 3 is a view taken on the line 3-3 of Figure 2,

Figure 4 is a 'view taken on the line 4-4 of Figure 2, with the hoist hook removed therefrom,

Figure 5 is an elevational view of a component of the clamping means shown in Figures 2 to 4,

Figure 6 is a view taken on the line 6-6 of Figure 5,

Figure 7 is an elevational view similar to Figure 2 showing the clamping means of the present invention supporting an I-beam at a particular angle corresponding to the angle of a roof under structure,

Figure 8 is a view taken on the line 8-8 of Figure 3,

Figure 9 is an elevational view showing the clamping means of the present invention in a position of use supporting a channel iron,

Figure 10 is a view taken on the line 10-10 of Figure 9,

Figure 11 is a view taken on the line 11-11 of Figure 10,

Figure 12 is an elevational view, on a reduced scale, showing the clamping means of the present invention in a modified form,

Figure 13 is an elevational view on a reduced scale showing the clamping means of the present invention supporting a channel iron, and

Figure 14 is an elevational view showing the clamping means releasing the channel iron as held in Figure 13.

In employing the apparatus of the present invention for mounting purlins on a skeleton roof under structure, a skeleton roof under structure, as at 20 is first provided. The structure 20 includes spaced girders 22 and 24 and purlins 26, 28 and 30, here shown as three in number in Figures 1 and la are first suspendingly supported in vertical spaced relation at the level of the ground 32 (Figure la) adjacent their place of storage. At: least one pair of clamping means or elements 34 are used to support each purlin 26, 28 and 30, to a hoisting frame 36. Each clamping element 34, to be described later, supports the adjacent portion of the respective purlin at a'pitch corresponding to the pitch of the girders 22 and 24. The re spective clamping elements 34 are connected to each other and to the frame 36 by means of short cables 37.

Next, the purlins, 26, 28 and 30, are elevated as a unit to a position above and adjacent the girders 22 and 24. First the purlin 26 and then the other purlins 28 and 30, respectively, are fixedly positioned on the girders 22 and 24 so as to extend transversely thereacross. As each purlin 26, 28 and 36, is molded or otherwise secured to the girders 22 and 24 they are released from their associated clamping elements 34. a

The frame 36 is supported upon the free end of a cable 38 depending from the upper end of the boom of a crane or other elevating mechanism, the cable 38 and boom 40 being of conventional construction.

In Figure 1, four purlins 26, 28, 30, 30' are shown with the last three suspended from the frame 36 and the first purlin 26 resting upon and fixedly secured to the girders 22 and 24.

Referring to Figures 2 to 8, inclusive, a first form of the clamping element 34 is illustrated and is seen to com-' prise a half moon-shaped part 42 facing toward and embracing a part of one side of a purlin 30 and another part 44 facing toward and embracing a part on the opposite side of the purlin 30. Releasable latching means is carried on the parts 42 and 44 for holding the parts 42 and 44 in assembled relation on the purlins 30. This means consists in an arm or tongue 46 projecting perpendicularly from the straight edge portion of the part 42 intermediate the ends of the latter. The tongue 46 is provided with a pair of spaced holes 48 and 50 each selectively receiving a locking pin 52. The part 44 is shown most clearly in Figures 5 and 6 and is seen to have a hole 54 receiving the tongue 46 when the part 44 is in its position overlying and embracing the upper flange of the purlin 30 and the pin 52 received in the one hole 50 adjacent the outer face of the part 24, as shown in Figures 2 and 7.

The portion of the curved edge of the part 42 is provided with spaced holes 56 extending from one of the terminating points of the straight edge of the part 42 to a point spaced from said terminating point. Each hole 56 is adapted to receive a hook 58 on the free end of the cable 38, the latter constituting a suspension member. As shown in Figures 2 and 7, the selection of the proper hole 56 for the engagement of the hook 58 determines the angle at which the purlin 30 is supported above the girder 22 or 24.

The straight edge of the part 42 of the clamping element 34 is provided with a notch 60 receiving the other half of the upper flange of the purlin 30. The lower end portion of the straight edge part of the clamping element 42 carries a transversely arranged foot 62 which bears against the web of the purlin 30 when the latter is supported in the notch 60 and under the lower end portion of the part 44.

Referring to Figures 9 to 14, inclusive a modified form of the clamping element 34' is shown in which the part 42 is identical and a wedge 64 is used with the part 42 for support ofa channel-shaped purlin 66. A pair ofarms 68 and 70 project outwardly from the part 42 beyond the free edge and each is provided with a verticallydisposed hole for the wedge 64 when the latter is positioned, as shown in Figure 9 with a portion adjacent the lower end abutting and holding the purlin 66- with one flange thereof received in the notch 60 provided in the clamping. element part 42. In this case, the pin 52' extends through the other hole 48 and wedges the wedge 64 against the purlin 66;

As.- shown. in. Figures 13 and. 14, instead of attaching the book 58 directly tothe part 42, in one of the holes 56, a short length of. cable 72 extends between the selected one of the holes 56; and the hook 58. Another length of cable 74. extends between the eye of the hook 58 and the; upper end. of the wedge 64. A third length of cable 76, extends between the lower end of the cable 74 in the lower part of the part 42, there being provided one or more holes 78 inthe; lower part of the part 42 for the,

attachment of such cable length 76. When the purlins 66 have been placed upon the girder or other portion of the under structure 20, as in Figure 14, the book 58 is disengaged from the cable length 72 and the hoisting cable 38 is, used to pull the wedge 64 out of the arms 68 and 70. The length of cable 76 prevents the falling of the clamping element part 42 and assists in tilting it so that it slips readily from the upper flange of the purlin 66.

Referring to Figure 12 a still further modified form of the clamping element isshown and designated by the reference numeral 34". An arm 80 has been added to the half-moon part of the clamping element 34", the arm having holes 82 therein selectively receiving the hook 58 of the hoisting apparatus. By positioning the hook 58 in any one of the holes 82 the tilt of the clamping element 34 can be controlled so as to support the purlin, here shown as a T-beam and designated by the reference nu meral 84, at an opposite angleto the angle of support of the purlins 26, 28 and 30.

In use, the purlins are assembled in a spot convenient to the operator of the crane or other elevating mechanism and are arranged horizontally with a suitable clamping element 34, 34- or 34" inwardly of each end of each purlin and dependingly suspended from an appropriate suspension means such as the cable 38. The clamping element 34, 34, 34", at one end of a purlin is in alignment 4 with the clamping element 34, 34', 34" at the other end of the purlin.

With each purlin arranged at the angle of the roof girder, the purlins are raised as a unit to a superimposed position above the roof girders and are lowered successively one at a time and affixed to the roof by suitable conventional means such as bolts or the like. As each purlin is secured to the roof girders, the assembly of purlins isshifted; laterally over; the roof to position each successive purlin in its proper position.

What is claimed is:

Apparatus for mounting purlins upon a skeleton roof under structure/which comprises. a hoisting; frame adapted to be positioned at a ground level adjacent said under structure, means on said frame for attachment to an overhead elevating means, spaced suspension members carried by said frame, and cooperating releasable clamping elements on the free ends of each of said members, said clamping elements on one suspension member being in alignment with the clamping elements on the other suspension member, said members each being adapted to support a purlin at apitch corresponding to the pitch of said under structure, each of said cooperating clamping elements comprising a half moon-shaped part having a straight edge adapted to face toward and embrace a p rt of one side of a purlin and an arm with a hole therein extending outwardly from said straight edge, andanother part mounted in said hole and said arm adapted to face toward and embrace a part of the opposite side of a purlin to thereby clamp said purlin therebetween, the portion ofthe curved edge of said half moon-shaped part being provided with spaced holes extending from one of the terminating points of said straight edge to a point spaced from said one terminating point and each adapted to supportingly receive a hook on the free end of a suspension member, and releasable latching means on said parts for holding the parts in assembled relation when applied to a purlin.

References Cited'in the file of this patent UNITEDv STATES PATENTS 2,142,109 Burke Jan. 3, 1939 2,412,555 Baker Dec. 17, 1946 2,703,252 Blackwell Mar. 1, 1955' 2,768,432 Hines Oct. 30, 1956 2,842,819 Granath July- 15, 1958 We: HA-16ml. A 

